okay I followed a recipe I found here and made a vit. c serum that included vit e oil, ferulic acid, jojoba oil and witch hazel. My question is that I have c powder from the personal formulator and I allowed them to dissolve for 30 minutes but I'm not sure they disolved but rather sat at the bottom of the glass for 30 minutes. If they disolve then that means there should be no residue in the glass, right? also my final serum has some residue kind of in the middle of the glass--suspended in the oil? and when I shake and put some in my hand there are some white flakes--not sure what it is, ferulic acid maybe. sorry for the long post but I was trying to give a good description so I can get some help. thanks so much. please let me know what I might be doing wrong, maybe the witch hazel isn't as strong as using vodka?